[dpdk-dev] [PATCH v5] usertools/devbind: fix binding for built-in kernel drivers

[Yongxin Liu <yongxin.liu@windriver.com>]

A driver can be loaded as a dynamic module or a built-in module.
In commit 681a67288655 ("usertools: check if module is loaded
before binding"), script only checks modules in /sys/module/.

However, for built-in kernel driver, it only shows up in /sys/module/,
if it has a version or at least one parameter. So add check for
modules in /lib/modules/$(uname -r)/modules.builtin.

Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com>
---

v5:
 - Make code robust and more memory efficient.

v4:
 - Replace shell call with platform.uname(). Check file existence
   before reading.

v3:
 - Add built-in module list in loaded_modules for checking
   instead of removing error check.

v2:
 - fix git commit description style in commit log
 - fix typo spelling

---
 usertools/dpdk-devbind.py | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/usertools/dpdk-devbind.py b/usertools/dpdk-devbind.py
index 054ad2e1c..4bc0b6207 100755
--- a/usertools/dpdk-devbind.py
+++ b/usertools/dpdk-devbind.py
@@ -7,6 +7,7 @@
 import os
 import subprocess
 import argparse
+import platform
 
 from glob import glob
 from os.path import exists, basename
@@ -107,7 +108,17 @@ def module_is_loaded(module):
 
     loaded_modules = sysfs_mods
 
-    return module in sysfs_mods
+    # add built-in modules as loaded
+    release = platform.uname().release
+    filename = os.path.join("/lib/modules/", release, "modules.builtin")
+    if os.path.exists(filename):
+        try:
+            with open(filename) as f:
+                loaded_modules += [os.path.splitext(os.path.basename(mod))[0] for mod in f]
+        except IOError:
+            print("Warning: cannot read list of built-in kernel modules")
+
+    return module in loaded_modules
 
 
 def check_modules():
-- 
2.14.4